<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>特殊取值测试</title>
  <style>
  @keyframes circling {
    from {
      transform: rotateZ(0deg);
    }
    to {
      transform: rotateZ(360deg);
    }
  }
  html, body {
    height: 100%;
    width: 100%;
  }
  body {
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .container {
    position: relative;
    width: 500px;
    height: 600px;
    background: url('../img/stars.jpeg');
    background-size: cover;
  }
  .bg {
    width: 100%;
    height: 100%;
    background: inherit;
    filter: blur(10px);
  }
  .circle {
    position: absolute;
    left: 50%;
    top: 20%;
    margin-left: -60px;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: 20px solid #008c8c;
    background: inherit;
    background-size: cover;
    animation: circling 2s infinite linear;
  }
  </style>
</head>
<body>
  <div class="container">
    <div class="bg"></div>
    <div class="circle"></div>
  </div>
</body>
</html>